Since the end of World War II tsunami have killed more people in the U.S. than earthquakes. Mysterious deadly and unlike other natural killers they exhibit no obvious warning signs. Yet within minutes the ocean rises to an amazing height sending tons...

The mountains called the Sierra Nevada are among the most picturesque in the U.S.--tourists marvel at the snow-capped peaks while skiing at Lake Tahoe. But the Snowy Mountains have also produced disasters, including the 1846 Donner Party tragedy that...